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wanghankun

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About wanghankun

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    Quark

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  • Favorite Area of Science
    Maths, Physics, Biology, Chemistry
  1. Someone has recommended this XFX 550W 80+ Bronze Certified ATX Power Supply to me, is it better?
  2. thx guys for your advice, Ill check the compatibilities. There are someone that suggested the powersupply is junk, should I buy better power supplies?
  3. CPU: AMD FX-8350 eight core GPU: GeForce GTX 760 HDD: WD Blue 1TB Mem:Crucial Ballistix sport single 8gb Mother board: ASUS M5A97 AM3+ SATA 6Gb/s USB 3.0 powersupply: Diablotek DA Series 600-Watt ATX Power Supply PSDA600 Case: Some random case my dad bought few years ago. The price is £411 VAT included. What do you guys think about this build?
  4. This is my first PC build, I want to build a PC which can play games that are coming out in the next 3/4 years. Since I dont know much about PC building, can you guys help me to decide which one of these builds to get? Thank you very much! http://www.forbes.com/sites/jasonevangelho/2015/02/07/build-a-compact-1080p-gaming-pc-for-400-benchmarks-included/ http://stickystatic.com/build-a-gaming-computer http://www.gamersnexus.net/pc-builds/1786-cheap-gaming-pc-build-guide-january http://www.eurogamer.net/articles/digitalfoundry-2015-budget-gaming-pc-guide
  5. someone ban the poster for preaching.
  6. skin wrinkles in water to increase friction so that you can grab better under the water. but im not sure how it happens.
  7. New brain cells could make you forget. So after many stem cell treatments, you, might not be you anymore. Hippocampal Neurogenesis Regulates Forgetting During Adulthood and Infancy Throughout life, new neurons are continuously added to the dentate gyrus. As this continuous addition remodels hippocampal circuits, computational models predict that neurogenesis leads to degradation or forgetting of established memories. Consistent with this, increasing neurogenesis after the formation of a memory was sufficient to induce forgetting in adult mice. By contrast, during infancy, when hippocampal neurogenesis levels are high and freshly generated memories tend to be rapidly forgotten (infantile amnesia), decreasing neurogenesis after memory formation mitigated forgetting. In precocial species, including guinea pigs and degus, most granule cells are generated prenatally. Consistent with reduced levels of postnatal hippocampal neurogenesis, infant guinea pigs and degus did not exhibit forgetting. However, increasing neurogenesis after memory formation induced infantile amnesia in these species. http://bms.ucsf.edu/sites/ucsf-bms.ixm.ca/files/shared/20140605.zubia_.mario_.pdf
  8. fMRI- Functional Magnetic Resonance Imaging machines uses strong magnetic field directly onto your brain. yes, the brain is disrupted by the magnetic field in some degree. The hydrogens lines up to the magnetic field. however, no effect to the conciousness of the dude in fMRI are ever shown. unless he walked into the fmri with some types of metal implant lol the dudes conciousness must be scarred for life... ps: i realized my understanding might be wrong. please correct me.
  9. problem is, I am going have to choose my subject in university later this year...... and i want to choose the field i am most interested in (which is something im not sure of). yes, i favour biology and physics more than chemistry. but im not sure what discipline under biology and/or physics i want to do. i think i have to visit universities (if i can get in), and ask arround.
  10. thanks for the reply. that was a nice description. I have a sence of blindness when trying to learn physics (and other scientific fields)... not from the text book, but from the internet and websites such as wikipedia. its makes me feel like a really ignorant person.
  11. My guess (im not an expert): Mitochondia produces free radical which could damage the cell organelles as well as the chromosomes. Toxins and whatever chemicals, ionizing radiation also damages the cell. Although there is cell repair mechanism, as the damage accumulates, the mechanism may not work as efficient as before. Its like an old engine, it gets damaged overtime, although you can fix it again and again but it will eventually not working completely. Therefore the cell goes apoptosis or eventually dies. Mitochondrial free radical generation, oxidative stress, and aging. Cadenas E1, Davies KJ. Author information AbstractMitochondria have been described as "the powerhouses of the cell" because they link the energy-releasing activities of electron transport and proton pumping with the energy conserving process of oxidative phosphorylation, to harness the value of foods in the form of ATP. Such energetic processes are not without dangers, however, and the electron transport chain has proved to be somewhat "leaky." Such side reactions of the mitochondrial electron transport chain with molecular oxygen directly generate the superoxide anion radical (O2*-), which dismutates to form hydrogen peroxide (H2O2), which can further react to form the hydroxyl radical (HO*). In addition to these toxic electron transport chain reactions of the inner mitochondrial membrane, the mitochondrial outer membrane enzyme monoamine oxidase catalyzes the oxidative deamination of biogenic amines and is a quantitatively large source of H2O2 that contributes to an increase in the steady state concentrations of reactive species within both the mitochondrial matrix and cytosol. In this article we review the mitochondrial rates of production and steady state levels of these reactive oxygen species. Reactive oxygen species generated by mitochondria, or from other sites within or outside the cell, cause damage to mitochondrial components and initiate degradative processes. Such toxic reactions contribute significantly to the aging process and form the central dogma of "The Free Radical Theory of Aging." In this article we review current understandings of mitochondrial DNA, RNA, and protein modifications by oxidative stress and the enzymatic removal of oxidatively damaged products by nucleases and proteases. The possible contributions of mitochondrial oxidative polynucleotide and protein turnover to apoptosis and aging are explored.
  12. I am disappointed by my high school physics education. My teacher teaches me physics in the textbook however not the nature of the physics: What is physics? Also the textbook only gives a mere introduction of the science, so i dont see the whole picture.
  13. Memory Encoding is a natural process when we look, hear, smell or think things. However, is there a way to encode memory artificially inside our brain?
  14. http://science.time.com/2013/04/15/music/ http://phenomena.nationalgeographic.com/2013/04/11/why-does-music-feel-so-good/ http://www.livescience.com/32473-why-do-we-love-music.html
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